Columnar grain width control for SS316L via hatch spacing manipulation in laser powder bed fusion

This study provides a quantitative way to tailor the grain structure in laser powder bed fusion (LPBF). Square-bottomed columnar grains (SCGs) were developed with a certain width roughly equal to the hatch spacing. The development of SCGs relied on different distinguishable regions, which were ident...

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書目詳細資料
Main Authors: Hu, Zhiheng, Gao, Shubo, Tai, Junfei, Qu, Shuo, Ding, Junhao, Song, Xu, Fan, Zheng
其他作者: School of Mechanical and Aerospace Engineering
格式: Article
語言:English
出版: 2023
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在線閱讀:https://hdl.handle.net/10356/165024
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機構: Nanyang Technological University
語言: English
實物特徵
總結:This study provides a quantitative way to tailor the grain structure in laser powder bed fusion (LPBF). Square-bottomed columnar grains (SCGs) were developed with a certain width roughly equal to the hatch spacing. The development of SCGs relied on different distinguishable regions, which were identified based on the differences in microstructural features between the melt-pool side and centreline. High lattice rotation accumulated at the melt-pool centreline, leading to grain boundaries forming at the centreline regions. The ultrasonic attenuation measurements and microhardness tests further validated the controllable properties. The findings indicated a novel approach to customise the material property.